基于QtAV的簡易播放器（開源）

2019-11-06 09:33:39
字體：大中小
來源：轉載
供稿：網友
這個開源代碼，是我利用QtAV源碼，提取其中一部分代碼，進行整合到我自己項目中，做的一個小型播放器測試，至于怎么安裝一些環境以及QtAV源碼編譯在我以前寫的一篇博客中可以看到（就不再敘述），因為看到有人提出說怎么調用接口，怎么整合到自己項目中的問題，因為網上資料關于QtAV的的確很少，由于也是去年年前帶我的師傅讓我了解調用接口，順便做個簡單的播放器，所以和大家分享下！！！該播放器主要實現了快進、后退、暫停、播放、選擇文件、調節音量大小等。
整個環境即編譯條件在Ubuntu 64位 Qt 5.7.0下運行成功！！！
這是運行界面截圖
廢話不多說，直接上代碼！！！
QtAVPlayer.PRo
#-------------------------------------------------## Project created by QtCreator 2017-01-16T22:05:51# author: yangshujie#-------------------------------------------------QT       += core guiQT += avwidgetsgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = QtAVPlayerTEMPLATE = appSOURCES += main.cpp/        mainwindow.cpp /    Slider.cppHEADERS  += mainwindow.h /    Slider.h
main.cpp
#include "mainwindow.h"#include <Qapplication>int main(int argc, char *argv[]){    Widgets::registerRenderers();    QApplication a(argc, argv);    MainWindow play;    play.show();    //play.setGeometry();    play.resize(800,500);    return a.exec();}
Slider.h
#ifndef SLIDER_H#define SLIDER_H#include <QSlider>class Slider : public QSlider{    Q_OBJECTpublic:    Slider(QWidget *parent = 0);    ~Slider();signals:    void onEnter();    void onLeave();    void onHover(int pos, int value);protected:    virtual void enterEvent(QEvent* event);    virtual void leaveEvent(QEvent *e);    virtual void mouseMoveEvent(QMouseEvent* event);    virtual void mousePressEvent(QMouseEvent *event);//#if CODE_FOR_CLICK == 1    inline int pick(const QPoint &pt) const;    int pixelPosToRangeValue(int pos) const;    void initStyleOption_Qt430(QStyleOptionSlider *option) const;//#endif};#endif // SLIDER_H
mainwindow.h
#ifndef MAINWINDOW_H#define MAINWINDOW_H#include "Slider.h"#include <QMainWindow>#include <QWidget>#include <QString>#include <QtAV>#include <QLabel>#include <QTime>#include <QAction>#include <QToolTip>#include <QWidgetAction>#include <QFileDialog>#include <QVBoxLayout>#include <QToolButton>#include <QSpinBox>#include <QMessageBox>#include <QTimeEdit>#include <QtAVWidgets>#include <QtAV/AVClock.h>#include <QtAV/AVPlayer.h>using namespace QtAV;//class Slider;class MainWindow : public QWidget{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();public slots:    void play(const QString &name);    void openFile();    void togglePlayPause();private slots:    void setupUi();    void initPlayer();    void setVolume();    void setRepeateMax(int m);    void stopUnload();    void seek();    void onPaused(bool p);    void onStartPlay();    void onStopPlay();    void onSeekFinished();    void onTimeSliderHover(int pos, int value);    void onTimeSliderLeave();    void handleError(const QtAV::AVError& e);    void onPositionChange(qint64 pos);    void showHideVolumeBar();    void tryShowControlBar();    void toggleRepeat(bool r);    void repeatAChanged(const QTime& t);    void repeatBChanged(const QTime& t);private:    int mRepeateMax;    int mCursorTimer;    bool mIsReady,mHaspendingPlay;    VideoOutput *mpVo;    AVPlayer *mpPlayer;    AVClock *mpClock;    VideoRenderer *mpRenderer, *mpTempRenderer;    QString mFile;    QString mTitle;    QTimeEdit *mpRepeatA, *mpRepeatB;    QVBoxLayout *mpPlayerLayout,*mainLayout;    QAction *mpRepeatEnableAction;    QWidgetAction *mpRepeatAction;    QWidget *mpControl;    QLabel *mpCurrent, *mpEnd;    QLabel *mpTitle;    QLabel *mpSpeed;    Slider *mpTimeSlider, *mpVolumeSlider;    QSpinBox *mpRepeatBox;    QToolButton *mpVolumeBtn;    QToolButton *mpPlayPauseBtn;    QToolButton *mpStopBtn, *mpForwardBtn, *mpBackwardBtn;    QToolButton *mpOpenBtn;    VideoPreviewWidget *m_preview;};#endif // MAINWINDOW_HSlider.cpp
#include "Slider.h"/*  smplayer, GUI front-end for mplayer.    Copyright (C) 2006-2010 Ricardo Villalba <rvm@escomposlinux.org>    This library is free software; you can redistribute it and/or    modify it under the terms of the GNU Lesser General Public    License as published by the Free Software Foundation; either    version 2.1 of the License, or (at your option) version 3, or any    later version accepted by the membership of KDE e.V. (or its    successor approved by the membership of KDE e.V.), Trolltech ASA    (or its successors, if any) and the KDE Free Qt Foundation, which shall    act as a proxy defined in Section 6 of version 3 of the license.    This library is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU    Lesser General Public License for more details.    You should have received a copy of the GNU Lesser General Public    License along with this library.  If not, see <http://www.gnu.org/licenses/>.*/#define CODE_FOR_CLICK 1 // 0 = old code, 1 = code copied from QSlider, 2 = button swap#include "Slider.h"#include <QApplication>#include <QMouseEvent>#if CODE_FOR_CLICK <= 1#include <QStyle>#if CODE_FOR_CLICK == 1#include <QStyleOption>#endif#endif#if QT_VERSION < 0x040300#define initStyleOption initStyleOption_Qt430#endif //QT_VERSIONSlider::Slider(QWidget *parent):    QSlider(parent){    setOrientation(Qt::Horizontal);    setMouseTracking(true); //mouseMoveEvent without press.}Slider::~Slider(){}#if CODE_FOR_CLICK == 1// Function copied from qslider.cppinline int Slider::pick(const QPoint &pt) const{    return orientation() == Qt::Horizontal ? pt.x() : pt.y();}// Function copied from qslider.cpp and modified to make it compilevoid Slider::initStyleOption_Qt430(QStyleOptionSlider *option) const{    if (!option)        return;    option->initFrom(this);    option->subControls = QStyle::SC_None;    option->activeSubControls = QStyle::SC_None;    option->orientation = orientation();    option->maximum = maximum();    option->minimum = minimum();    option->tickPosition = (QSlider::TickPosition) tickPosition();    option->tickInterval = tickInterval();    option->upsideDown = (orientation() == Qt::Horizontal) ?                     (invertedAppearance() != (option->direction == Qt::RightToLeft))                     : (!invertedAppearance());    option->direction = Qt::LeftToRight; // we use the upsideDown option instead    option->sliderPosition = sliderPosition();    option->sliderValue = value();    option->singleStep = singleStep();    option->pageStep = pageStep();    if (orientation() == Qt::Horizontal)        option->state |= QStyle::State_Horizontal;}// Function copied from qslider.cpp and modified to make it compileint Slider::pixelPosToRangeValue(int pos) const{    QStyleOptionSlider opt;    initStyleOption(&opt);    QRect gr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, this);    QRect sr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);    int sliderMin, sliderMax, sliderLength;    if (orientation() == Qt::Horizontal) {        sliderLength = sr.width();        sliderMin = gr.x();        sliderMax = gr.right() - sliderLength + 1;    } else {        sliderLength = sr.height();        sliderMin = gr.y();        sliderMax = gr.bottom() - sliderLength + 1;    }    return QStyle::sliderValueFromPosition(minimum(), maximum(), pos - sliderMin,                                           sliderMax - sliderMin, opt.upsideDown);}void Slider::enterEvent(QEvent *event){    emit onEnter();    QSlider::enterEvent(event);}void Slider::leaveEvent(QEvent *e){    emit onLeave();    QSlider::leaveEvent(e);}void Slider::mouseMoveEvent(QMouseEvent *e){    const int o = style()->pixelMetric(QStyle::PM_SliderLength ) - 1;    int v = QStyle::sliderValueFromPosition(minimum(), maximum(), e->pos().x()-o/2, width()-o, false);    emit onHover(e->x(), v);    QSlider::mouseMoveEvent(e);}// Based on code from qslider.cppvoid Slider::mousePressEvent(QMouseEvent *e){    qDebug("pressed (%d, %d)", e->pos().x(), e->pos().y());    if (e->button() == Qt::LeftButton) {        QStyleOptionSlider opt;        initStyleOption(&opt);        const QRect sliderRect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);        const QPoint center = sliderRect.center() - sliderRect.topLeft();        // to take half of the slider off for the setSliderPosition call we use the center - topLeft        if (!sliderRect.contains(e->pos())) {            qDebug("accept");            e->accept();            int v = pixelPosToRangeValue(pick(e->pos() - center));            setSliderPosition(v);            triggerAction(SliderMove);            setRepeatAction(SliderNoAction);            emit sliderMoved(v);//TODO: ok?            emit sliderPressed(); //TODO: ok?        } else {            QSlider::mousePressEvent(e);        }    } else {        QSlider::mousePressEvent(e);    }}#endif // CODE_FOR_CLICK == 1#if CODE_FOR_CLICK == 2void Slider::mousePressEvent(QMouseEvent *e){    // Swaps middle button click with left click    if (e->button() == Qt::LeftButton) {        QMouseEvent ev2(QEvent::MouseButtonRelease, e->pos(), e->globalPos(), Qt::MidButton, Qt::MidButton, e->modifiers());        QSlider::mousePressEvent(&ev2);    } else if (e->button() == Qt::MidButton) {        QMouseEvent ev2(QEvent::MouseButtonRelease, e->pos(), e->globalPos(), Qt::LeftButton, Qt::LeftButton, e->modifiers());        QSlider::mousePressEvent(&ev2);    }    else {        QSlider::mousePressEvent(e);    }}#endif // CODE_FOR_CLICK == 2#if CODE_FOR_CLICK == 0void Slider::mousePressEvent(QMouseEvent *e){    // FIXME:    // The code doesn't work well with right to left layout,    // so it's disabled.    if (qApp->isRightToLeft()) {        QSlider::mousePressEvent(e);        return;    }    int range = maximum()-minimum();    int pos = (e->x() * range) / width();    //qDebug( "width: %d x: %d", width(), e->x());    //qDebug( "range: %d pos: %d value: %d", range, pos, value());    // Calculate how many positions takes the slider handle    int metric = qApp->style()->pixelMetric(QStyle::PM_SliderLength);    double one_tick_pixels = (double)width() / range;    int slider_handle_positions = (int)(metric / one_tick_pixels);    /*    qDebug("metric: %d", metric );    qDebug("one_tick_pixels :%f", one_tick_pixels);    qDebug("width() :%d", width());    qDebug("slider_handle_positions: %d", slider_handle_positions);    */    if (abs(pos - value()) > slider_handle_positions) {        setValue(pos);        emit sliderMoved(pos);    } else {        QSlider::mousePressEvent(e);    }}#endifmainwindow.cpp
#include "mainwindow.h"#include <QTimer>const qreal kVolumeInterval = 0.04;MainWindow::MainWindow(QWidget *parent) :    QWidget(parent),mpPlayer(0),mpVo(0),mpTempRenderer(0){    setWindowTitle("QtAV Player");    setupUi();}MainWindow::~MainWindow(){    if (m_preview) {        m_preview->close();        delete m_preview;    }    if (mpVolumeSlider && !mpVolumeSlider->parentWidget()) {        mpVolumeSlider->close();        delete mpVolumeSlider;        mpVolumeSlider = 0;    }}void MainWindow::setupUi(){    mpPlayer = new AVPlayer(this);    mainLayout = new QVBoxLayout();    mainLayout->setSpacing(0);    mainLayout->setMargin(0);    setLayout(mainLayout);    mpControl = new QWidget(this);    mpControl->setMaximumHeight(30);    mpTimeSlider = new Slider(mpControl);    mpTimeSlider->setDisabled(true);    mpTimeSlider->setTracking(true);    mpTimeSlider->setOrientation(Qt::Horizontal);    mpTimeSlider->setMinimum(0);    mpCurrent = new QLabel(mpControl);    mpCurrent->setToolTip(tr("Current time"));    mpCurrent->setMargin(2);    mpCurrent->setText(QString::fromLatin1("00:00:00"));    mpEnd = new QLabel(mpControl);    mpEnd->setToolTip(tr("Duration"));    mpEnd->setMargin(2);    mpEnd->setText(QString::fromLatin1("00:00:00"));    mpTitle = new QLabel(mpControl);    mpTitle->setToolTip(tr("Author"));    mpTitle->setText(QString::fromLatin1("YangShuJie"));    mpTitle->setIndent(8);    mpPlayPauseBtn = new QToolButton(mpControl);    mpPlayPauseBtn->setToolTip(tr("Play"));    mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/play.png")));    mpStopBtn = new QToolButton(mpControl);    mpStopBtn->setToolTip(tr("Stop"));    mpStopBtn->setIcon(QIcon(QString::fromLatin1("./image/stop.png")));    mpBackwardBtn = new QToolButton(mpControl);    mpBackwardBtn->setToolTip(tr("Backward"));    mpBackwardBtn->setIcon(QIcon(QString::fromLatin1("./image/backward.png")));    mpForwardBtn = new QToolButton(mpControl);    mpForwardBtn->setToolTip(tr("Forward"));    mpForwardBtn->setIcon(QIcon(QString::fromLatin1("./image/forward.png")));    mpOpenBtn = new QToolButton(mpControl);    mpOpenBtn->setToolTip(tr("Open"));    mpOpenBtn->setIcon(QIcon(QString::fromLatin1("./image/open.png")));    mpVolumeBtn = new QToolButton();    mpVolumeBtn->setToolTip(tr("Volume"));    mpVolumeBtn->setIcon(QIcon(QString::fromLatin1("./image/sound.png")));    mpVolumeSlider = new Slider();    mpVolumeSlider->hide();    mpVolumeSlider->setOrientation(Qt::Horizontal);    mpVolumeSlider->setMinimum(0);    const int kVolumeSliderMax = 100;    mpVolumeSlider->setMaximum(kVolumeSliderMax);    //mpVolumeSlider->setMaximumHeight(12);    mpVolumeSlider->setMaximumWidth(88);    mpVolumeSlider->setValue(int(1.0/kVolumeInterval*qreal(kVolumeSliderMax)/100.0));    setVolume();    QWidgetAction *pWA = 0;//  QLabel *pRepeatLabel = new QLabel(tr("Times"));    QHBoxLayout *hb = new QHBoxLayout;//    hb->addWidget(pRepeatLabel);    hb->addWidget(mpRepeatBox);    QVBoxLayout *vb = new QVBoxLayout;    vb->addLayout(hb);//    pRepeatLabel = new QLabel(tr("From"));    mpRepeatA = new QTimeEdit();    mpRepeatA->setDisplayFormat(QString::fromLatin1("HH:mm:ss"));    mpRepeatA->setToolTip(tr("negative value means from the end"));    connect(mpRepeatA, SIGNAL(timeChanged(QTime)), SLOT(repeatAChanged(QTime)));    hb = new QHBoxLayout;//    hb->addWidget(pRepeatLabel);    hb->addWidget(mpRepeatA);    vb->addLayout(hb);//    pRepeatLabel = new QLabel(tr("To"));    mpRepeatB = new QTimeEdit();    mpRepeatB->setDisplayFormat(QString::fromLatin1("HH:mm:ss"));    mpRepeatB->setToolTip(tr("negative value means from the end"));    connect(mpRepeatB, SIGNAL(timeChanged(QTime)), SLOT(repeatBChanged(QTime)));    hb = new QHBoxLayout;//    hb->addWidget(pRepeatLabel);    hb->addWidget(mpRepeatB);    vb->addLayout(hb);    QWidget *wgt = new QWidget;    wgt->setLayout(vb);    pWA = new QWidgetAction(0);    pWA->setDefaultWidget(wgt);    pWA->defaultWidget()->setEnabled(false);     mpRepeatAction = pWA;    mpVo = new VideoOutput(this);    if (!mpVo->widget()) {        QMessageBox::warning(0, QString::fromLatin1("QtAV error"), tr("Can not create video renderer"));        return;    }    mpPlayer->setRenderer(mpVo);    mainLayout->addWidget(mpVo->widget());    mainLayout->addWidget(mpTimeSlider);    mainLayout->addWidget(mpControl);    QHBoxLayout *controlLayout = new QHBoxLayout();    controlLayout->setSpacing(0);    controlLayout->setMargin(1);    mpControl->setLayout(controlLayout);    controlLayout->addWidget(mpCurrent);    controlLayout->addWidget(mpTitle);    QSpacerItem *space = new QSpacerItem(mpPlayPauseBtn->width(), mpPlayPauseBtn->height(), QSizePolicy::MinimumExpanding);    controlLayout->addSpacerItem(space);    controlLayout->addWidget(mpVolumeSlider);    controlLayout->addWidget(mpVolumeBtn);    controlLayout->addWidget(mpStopBtn);    controlLayout->addWidget(mpBackwardBtn);    controlLayout->addWidget(mpPlayPauseBtn);    controlLayout->addWidget(mpForwardBtn);    controlLayout->addWidget(mpOpenBtn);    controlLayout->addWidget(mpEnd);    connect(mpOpenBtn, SIGNAL(clicked()), SLOT(openFile()));    connect(mpPlayPauseBtn, SIGNAL(clicked()), SLOT(togglePlayPause()));    mIsReady = true;//    connect(mpTimeSlider, SIGNAL(sliderMoved(int)), SLOT(seek(int)));    connect(mpTimeSlider, SIGNAL(sliderPressed()), SLOT(seek()));    connect(mpTimeSlider, SIGNAL(sliderReleased()), SLOT(seek()));    connect(mpTimeSlider, SIGNAL(onLeave()), SLOT(onTimeSliderLeave()));    connect(mpTimeSlider, SIGNAL(onHover(int,int)), SLOT(onTimeSliderHover(int,int)));    QTimer::singleShot(0, this, SLOT(initPlayer()));}void MainWindow::initPlayer(){    connect(mpVolumeBtn, SIGNAL(clicked()), SLOT(showHideVolumeBar()));    connect(mpVolumeSlider, SIGNAL(sliderPressed()), SLOT(setVolume()));    connect(mpVolumeSlider, SIGNAL(valueChanged(int)), SLOT(setVolume()));    connect(mpStopBtn, SIGNAL(clicked()), this, SLOT(stopUnload()));    connect(mpForwardBtn, SIGNAL(clicked()), mpPlayer, SLOT(seekForward()));    connect(mpBackwardBtn, SIGNAL(clicked()), mpPlayer, SLOT(seekBackward()));    connect(mpPlayer, SIGNAL(seekFinished()), SLOT(onSeekFinished()));    connect(mpPlayer, SIGNAL(error(QtAV::AVError)), this, SLOT(handleError(QtAV::AVError)));    connect(mpPlayer, SIGNAL(started()), this, SLOT(onStartPlay()));    connect(mpPlayer, SIGNAL(stopped()), this, SLOT(onStopPlay()));    connect(mpPlayer, SIGNAL(paused(bool)), this, SLOT(onPaused(bool)));    //    connect(mpPlayer, SIGNAL(speedChanged(qreal)), this, SLOT(onSpeedChange(qreal)));    connect(mpPlayer, SIGNAL(positionChanged(qint64)), this, SLOT(onPositionChange(qint64)));}void MainWindow::stopUnload(){    mpPlayer->stop();    mpPlayer->unload();}void MainWindow::handleError(const AVError &e){    QMessageBox::warning(0, tr("Player error"), e.string());}void MainWindow::onStartPlay(){    mFile = mpPlayer->file(); //open from EventFilter's menu    mTitle = mFile;    if (!mFile.contains(QLatin1String("://")) || mFile.startsWith(QLatin1String("file://")))        mTitle = QFileInfo(mFile).fileName();    setWindowTitle(mTitle);    mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/pause.png")));    mpTimeSlider->setMinimum(mpPlayer->mediaStartPosition());    mpTimeSlider->setMaximum(mpPlayer->mediaStopPosition());    mpTimeSlider->setValue(0);    mpTimeSlider->setEnabled(mpPlayer->isSeekable());    mpEnd->setText(QTime(0, 0, 0).addMSecs(mpPlayer->mediaStopPosition()).toString(QString::fromLatin1("HH:mm:ss")));    setVolume();    QTimer::singleShot(3000, this, SLOT(tryHideControlBar()));    mpRepeatA->setMinimumTime(QTime(0, 0, 0).addMSecs(mpPlayer->mediaStartPosition()));    mpRepeatA->setMaximumTime(QTime(0, 0, 0).addMSecs(mpPlayer->mediaStopPosition()));    mpRepeatB->setMinimumTime(QTime(0, 0, 0).addMSecs(mpPlayer->mediaStartPosition()));    mpRepeatB->setMaximumTime(QTime(0, 0, 0).addMSecs(mpPlayer->mediaStopPosition()));    mpRepeatA->setTime(QTime(0, 0, 0).addMSecs(mpPlayer->startPosition()));    mpRepeatB->setTime(QTime(0, 0, 0).addMSecs(mpPlayer->stopPosition()));    mCursorTimer = startTimer(3000);}void MainWindow::onStopPlay(){    if (mpPlayer->currentRepeat() < mpPlayer->repeat())        return;    mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/play.png")));    mpTimeSlider->setValue(0);    qDebug(">>>>>>>>>>>>>>disable slider");    mpTimeSlider->setDisabled(true);    mpTimeSlider->setMinimum(0);    mpTimeSlider->setMaximum(0);    mpCurrent->setText(QString::fromLatin1("00:00:00"));    mpEnd->setText(QString::fromLatin1("00:00:00"));    tryShowControlBar();    toggleRepeat(false);//    mRepeateMax = 0;    killTimer(mCursorTimer);    unsetCursor();    if (m_preview)        m_preview->setFile(QString());}void MainWindow::seek(){    mpPlayer->setSeekType(AccurateSeek);    mpPlayer->seek((qint64)mpTimeSlider->value());}void MainWindow::onTimeSliderLeave(){    if (m_preview && m_preview->isVisible())        m_preview->hide();}void MainWindow::onTimeSliderHover(int pos, int value){    QPoint gpos = mapToGlobal(mpTimeSlider->pos() + QPoint(pos, 0));    QToolTip::showText(gpos, QTime(0, 0, 0).addMSecs(value).toString(QString::fromLatin1("HH:mm:ss")));    if (!m_preview)        m_preview = new VideoPreviewWidget();    m_preview->setFile(mpPlayer->file());    m_preview->setTimestamp(value);    m_preview->setWindowFlags(m_preview->windowFlags() |Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint);}void MainWindow::onPaused(bool p){    if (p) {        qDebug("start pausing...");        mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/play.png")));    } else {        qDebug("stop pausing...");        mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/pause.png")));    }}void MainWindow::showHideVolumeBar(){    if (mpVolumeSlider->isHidden()) {        mpVolumeSlider->show();    } else {        mpVolumeSlider->hide();    }}void MainWindow::tryShowControlBar(){    unsetCursor();    if (mpTimeSlider && mpTimeSlider->isHidden())        mpTimeSlider->show();    if (mpControl && mpControl->isHidden())        mpControl->show();}void MainWindow::toggleRepeat(bool r){    mpRepeatAction->defaultWidget()->setEnabled(r); //why need defaultWidget?    if (r) {        mRepeateMax = mpRepeatBox->value();    } else {        mRepeateMax = 0;    }    if (mpPlayer) {        mpPlayer->setRepeat(mRepeateMax);    }}void MainWindow::setVolume(){    AudioOutput *ao = mpPlayer ? mpPlayer->audio() : 0;    qreal v = qreal(mpVolumeSlider->value())*kVolumeInterval;    if (ao) {        if (qAbs(int(ao->volume()/kVolumeInterval) - mpVolumeSlider->value()) >= int(0.1/kVolumeInterval)) {            ao->setVolume(v);        }    }    mpVolumeSlider->setToolTip(QString::number(v));    mpVolumeBtn->setToolTip(QString::number(v));}void MainWindow::openFile(){    QString file = QFileDialog::getOpenFileName(0, tr("Open a media file"));    if (file.isEmpty())        return;    play(file);}void MainWindow::onPositionChange(qint64 pos){    if (mpPlayer->isSeekable())        mpTimeSlider->setValue(pos);    mpCurrent->setText(QTime(0, 0, 0).addMSecs(pos).toString(QString::fromLatin1("HH:mm:ss")));}void MainWindow::togglePlayPause(){    if (mpPlayer->isPlaying()) {        qDebug("isPaused = %d", mpPlayer->isPaused());        mpPlayer->pause(!mpPlayer->isPaused());    } else {        if (mFile.isEmpty())            return;        if (!mpPlayer->isPlaying()){            play(mFile);        }        else{//            qDebug()<<"111111111111111111111111111111111111111/n";            mpPlayer->play();            mpPlayPauseBtn->setIcon(QIcon(QString::fromLatin1("./image/pause.png")));       }    }}void MainWindow::play(const QString &name){    mFile = name;    if (!mIsReady) {        mHasPendingPlay = true;        return;    }    mTitle = mFile;    if (!mFile.contains(QLatin1String("://")) || mFile.startsWith(QLatin1String("file://"))) {        mTitle = QFileInfo(mFile).fileName();    }    setWindowTitle(mTitle);    mpPlayer->play(name);}void MainWindow::onSeekFinished(){    qDebug("seek finished at %lld", mpPlayer->position());}void MainWindow::setRepeateMax(int m){    mRepeateMax = m;    if (mpPlayer) {        mpPlayer->setRepeat(m);    }}void MainWindow::repeatAChanged(const QTime& t){    if (!mpPlayer)        return;    mpPlayer->setStartPosition(QTime(0, 0, 0).msecsTo(t));}void MainWindow::repeatBChanged(const QTime& t){    if (!mpPlayer)        return;    // when this slot is called? even if only range is set?    if (t <= mpRepeatA->time())        return;    mpPlayer->setStopPosition(QTime(0, 0, 0).msecsTo(t));}       說明下：Slider.h和Slider.cpp這個類所有代碼我沒動過，從QtAV代碼中截取出來，有些槽函數未使用到（主要是是因為我怕以后可能要進行擴展，所以全部保存了下來），這個播放器我大概花了2~3天左右，包括搭環境、寫代碼、調試等，有不好的地方見諒，希望能幫到很多人！！！
       可能因為第一次編輯沒弄好，寫完最后老是有下面一段亂的，不管了@_@
我已將代碼上傳至百度云，歡迎下載！！！鏈接：http://pan.baidu.com/s/1i5DQthV 密碼：1e84